cbe5dd2cf5
Previously know as [patriknw/akka-data-replication](https://github.com/patriknw/akka-data-replication), which was originally inspired by [jboner/akka-crdt](https://github.com/jboner/akka-crdt). The functionality is very similar to akka-data-replication 0.11. Here is a list of the most important changes: * The package name changed to `akka.cluster.ddata` * The extension was renamed to `DistributedData` * The keys changed from strings to classes with unique identifiers and type information of the data values, e.g. `ORSetKey[Int]("set2")` * The optional read consistency parameter was removed from the `Update` message. If you need to read from other replicas before performing the update you have to first send a `Get` message and then continue with the ``Update`` when the ``GetSuccess`` is received. * `BigInt` is used in `GCounter` and `PNCounter` instead of `Long` * Improvements of java api * Better documentation
66 lines
1.7 KiB
Scala
66 lines
1.7 KiB
Scala
/**
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* Copyright (C) 2009-2015 Typesafe Inc. <http://www.typesafe.com>
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*/
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package akka.cluster.ddata
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object GSet {
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private val _empty: GSet[Any] = new GSet(Set.empty)
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def empty[A]: GSet[A] = _empty.asInstanceOf[GSet[A]]
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def apply(): GSet[Any] = _empty
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/**
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* Java API
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*/
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def create[A](): GSet[A] = empty[A]
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// unapply from case class
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}
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/**
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* Implements a 'Add Set' CRDT, also called a 'G-Set'. You can't
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* remove elements of a G-Set.
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*
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* It is described in the paper
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* <a href="http://hal.upmc.fr/file/index/docid/555588/filename/techreport.pdf">A comprehensive study of Convergent and Commutative Replicated Data Types</a>.
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*
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* A G-Set doesn't accumulate any garbage apart from the elements themselves.
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*
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* This class is immutable, i.e. "modifying" methods return a new instance.
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*/
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@SerialVersionUID(1L)
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final case class GSet[A](elements: Set[A]) extends ReplicatedData with ReplicatedDataSerialization {
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type T = GSet[A]
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/**
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* Java API
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*/
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def getElements(): java.util.Set[A] = {
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import scala.collection.JavaConverters._
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elements.asJava
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}
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def contains(a: A): Boolean = elements(a)
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def isEmpty: Boolean = elements.isEmpty
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def size: Int = elements.size
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/**
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* Adds an element to the set
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*/
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def +(element: A): GSet[A] = add(element)
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/**
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* Adds an element to the set
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*/
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def add(element: A): GSet[A] = copy(elements + element)
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override def merge(that: GSet[A]): GSet[A] = copy(elements ++ that.elements)
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}
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object GSetKey {
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def create[A](id: String): Key[GSet[A]] = GSetKey(id)
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}
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@SerialVersionUID(1L)
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final case class GSetKey[A](_id: String) extends Key[GSet[A]](_id) with ReplicatedDataSerialization
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